BestAir 22"x24"x1 Pleated MERV 8 Air Filter. Effective against bacteria, pollen, dust/lint, and mold spores, it reduces up to 75% of large airborne particles. The MERV 8 rating means it is third-party certified to effectively reduce common indoor air pollutants such as household dust, pollen, dander, and lint. MERV ratings provide a standard comparison of air filter performance. A higher MERV rating signifies greater efficiency and increased protection against airborne particles. The clay-coated filter frame and wire backing provide durability throughout the filter's life. The NaturalAire clean essential air filter maintains the minimum listed efficiency.,6x times more effective than traditional fiberglass air filters, Efficient airborne particle removal for a cleaner indoor environment, Robust construction makes the filter easy to install, Maintains efficiency for up to 90 days, UL Classified.